Issue 7281: batch delete snapshot

[Lyndon-Li]

Fix issue #7281, batch delete snapshots in the same repo

[codecov]

Codecov Report

Attention: Patch coverage is 46.82540% with 67 lines in your changes are missing coverage. Please review.

Project coverage is 61.72%. Comparing base (3b8370e) to head (d538fc8).
Report is 57 commits behind head on main.

Files	Patch %	Lines
pkg/controller/backup_deletion_controller.go	52.50%	19 Missing ⚠️
pkg/repository/manager.go	0.00%	18 Missing ⚠️
pkg/podvolume/util.go	0.00%	13 Missing ⚠️
pkg/repository/provider/restic.go	0.00%	7 Missing ⚠️
pkg/datamover/dataupload_delete_action.go	0.00%	3 Missing ⚠️
pkg/repository/provider/unified_repo.go	92.68%	2 Missing and 1 partial ⚠️
pkg/datamover/util.go	0.00%	2 Missing ⚠️
pkg/cmd/server/server.go	0.00%	1 Missing ⚠️
pkg/controller/data_upload_controller.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7438      +/-   ##
==========================================
+ Coverage   61.64%   61.72%   +0.07%     
==========================================
  Files         262      263       +1     
  Lines       28477    28972     +495     
==========================================
+ Hits        17556    17884     +328     
- Misses       9689     9822     +133     
- Partials     1232     1266      +34     

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